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<h1 class="RH1">Harcsin Function</h1>
<p class="T">Returns the inverse hyperbolic sine of a number. The inverse 
hyperbolic sine is the value whose hyperbolic sine is <i>number</i>, so 
harcsin(hsin(number)) equals <i>number</i>.</p>
<p class="RL"><b>Syntax</b></p>
<p class="SYN"><b>harcsin</b>(<b>number</b>)</p>
<p class="DT1">Number&nbsp;&nbsp; is any valid
<a href="reference_numeric_expression.htm">numeric expression</a>.</p>
<p class="RL"><b>Example</b></p>
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    <th>Description (Result)</th>
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    <td>harcsin(-2.5)</td>
    <td>Inverse hyperbolic sine of -2.5 (-1.64723)</td>
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    <td>harcsin(10)</td>
    <td>Inverse hyperbolic sine of 10 (2.998223)</td>
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